Radiant heater

Claim 1

A HEATING UNIT COMPRISING: A PRIMARY WALL HAVING COMBUSTION REACTION AND EMITTED ENERGY RECEIVING WALL SURFACE MEANS, SAID COMBUSTION REACTION EMITTING RADIANT HEAT ENERGY AND EXHAUST GASES CONTAINING CONVECTION HEAT ENERGY, A SECONDARY WALL HAVING WALL SURFACE MEANS FOR RECEIVING AND REFLECTING SAID EMITTED ENERGY FROM SAID PRIMARY WALL SURFACE MEANS, SAID SECONDARY WALL COMPRISING A BLOCK HAVING A CAVITY FORMED THEREIN WHICH HAS A LONGITUDINAL AXIS, SAID CAVITY BEING FORMED ABOUT SAID PRIMARY WALL AND HAVING AN OUTLET THEREIN, SAID PRIMARY WALL COMPRISING AN ELONGATED HOLLOW TUBE EXTENDING BETWEEN THE ENDS OF SAID CAVITY AND ALONG THE LONGITUDINAL AXIS THEREOF, SAID COMBUSTION REACTION AND EMITTED ENERGY RECEIVING WALL SURFACE MEANS BEING THE OUTER PERIPHERAL SURFACE OF SAID TUBE, AND SAID SECONDARY WALL SURFACE MEANS BEING THE CAVITY SURFACE OF SAID BLOCK FACING SAID PERIPHERAL SURFACE OF SAID ELONGATED TUBE, EACH OF SAID WALL SURFACE MEANS COMPRISING AMORPHOUS, INORGANIC REFRACTORY FIBERS ARRANGED IN A POROUS WALL STRUCTURE, AND MEANS FOR CONDUCTING A COMBUSTIBLLE GAS MIXTURE TO SAID PRIMARY WALL SURFACE MEANS WHEREBY SAID COMBUSTION REACTION OCCURS AT SAID PRIMARY WALL SURFACE MEANS, SAID FIBERS OF SAID PRIMARY WALL SURFACE MEANS THEREBY INCANDESCING AND SAID FIBERS OF SAID SECONDARY WALL SURFACE MEANS ALSO INCANDESCING UPON IMPINGEMENT THEREOF SAID EMITTED ENERGY FROM SAID PRIMARY WALL SURFACE MEANS.